Physical Metamaterial Experiments (IMAGE) University of Pennsylvania Caption "Physical experiments showed that the location of the dielectric rod and the shape of the ENZ material did not effect the properties of the resulting metamaterial." Credit University of Pennsylvania Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.